PARTITION t1_le_101 VALUES LESS THAN (101) ) INCLUDING ROWS WHERE id <= 50; 1. 2. 3. 4. 5. 6. 注意including row 后跟的条件为保留的数据,千万别写反 ORACLE-BASE - Filtered Partition Maintenance Operations in Oracle Database 12c Release 2 (12.2) Partitioning: Multi-Column List Partitionin...
范围分区表是通过 create table 语句的 partition by range 子句来创建的,分区的范围通过 values less than 子句指定,其指定的是分区的上限(不包含),所有大于等于指定值的数据被分配至下一个分区,除了第一个分区,每个分区的下限即前一个分区的上限: create table members ( id number, name varchar2(32), creat...
This articleby Younes Naguib describes how to display multiple values from a single column in a single output row. In his example, he displays multiple values of the last name column on a single row. Note his use of thesys_connect_by_pathandoveroperators: select deptno, substr(SYS_CONNECT_...
CREATE TABLE table_name ( ... ) PARTITION BY RANGE(column1) INTERVAL expr [STORE IN (tablespace1,[tablespace2,...])] ( PARTITION partition_name1 VALUES LESS THAN(literal | MAXVALUE) [TABLESPACE tablespace1], PARTITION partition_name2 VALUES LESS THAN(literal | MAXVALUE) [TABLESPACE tablesp...
TRUNCATE PARTITIONS statement does this for multiple partitions. 使用ALTER TABLE ... TRUNCATE PARTITION 语句从表分区中删除所有行。ALTER TABLE ... TRUNCATE PARTITIONS语句对多个分区执行此操作。 Truncating a partition is similar to dropping a partition, except that the partition is emptied of its data...
ALTERTABLEt_operate_logADDPARTITION t_operate_log_4VALUESLESS THAN(400); 1. 但是要注意一点,如果一个分区的范围是maxvalue(比如把300替换成maxvalue),添加分区会失败。 我们也可以用下面命令删除一个分区: 复制 ALTERTABLEt_operate_logDROPPARTITION t_operate_log_4; ...
ALTER TABLE table_name ADD SUPPLEMENTAL LOG GROUP log_group_name (column1, column2, column3) ALWAYS; 开启ALL 级别的补偿日志的方式如下: --方式一:开启 DataBase 级别 ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (ALL) COLUMNS; --方式二:开启 Table 级别 ALTER TABLE table_name ADD SUPPLEMENTAL LOG...
7 partition xff_2009 values less than (TO_DATE('01-01-2010','dd-MM-yyyy'))); Table created. SQL> SET LONG 30 SQL> select PARTITION_NAME,HIGH_VALUE FROM USER_TAB_PARTITIONS where table_name='T_XIFENFEI'; PARTITION_NAME HIGH_VALUE ...
When to Partition an Index Here are some suggestions for when to consider partitioning an index: Avoidrebuilding the entire indexwhendataisremoved. Performmaintenance on parts of the data without invalidating the entire index. Reducethe impact of index skew causedbyan index on a columnwitha monoton...
In the LOCATION clause, the files are named in the form directory:file , and one clause can specify multiple files. The directory portion is optional. The following rules apply for the directory used by a partition or subpartition: When a directory is specified in the LOCATION clause for a ...